A high sealing screw pump

Abstract

The utility model provides a kind of high sealing screw pump, belong to screw pump technical field.It solves the problem of insufficient sealing of screw pump in prior art.The utility model includes first pump shell, second pump shell, intermediate end cover and screw assembly, and first sealing convex body is formed in the two sides of intermediate end cover middle part, and first sealing groove and second sealing groove are respectively set up in the inside end face of first pump shell and second pump shell, and first sealing ring and second sealing ring are respectively installed in first sealing groove and second sealing groove, and liquid flange body is fixedly installed in the outside of first pump shell, third sealing groove is set up in the outside end face of first pump shell, third sealing ring is installed in third sealing groove, pump cover is fixedly installed in the outside of second pump shell, fourth sealing groove is set up in the outside end face of second pump shell, fourth sealing ring is installed in fourth sealing groove, and second sealing convex body is formed in the inside of pump cover.The utility model has the advantages of high sealing, easy to assemble and disassemble.

Description

Technical Field

[0001] This utility model belongs to the field of screw pump technology and relates to a high-sealing screw pump. Background Technology

[0002] A screw pump is a high-efficiency positive displacement fluid transfer device. Its core consists of a screw and a bushing forming a sealed meshing pair. Its working principle is that the rotating screw creates a continuous sealed cavity, smoothly pushing the medium to the outlet with minimal pulsation and disturbance.

[0003] Chinese patent publication number CN207178193U discloses a screw pump, including a pump body and a pump housing fitted inside the pump body. The pump housing has a delivery chamber for liquid delivery. The delivery chamber contains a main screw and a driven screw that is threadedly engaged with the main screw. A liquid storage chamber is formed between the rear end of the pump housing and the pump body. A limiting device is provided in the liquid storage chamber to prevent axial movement of the driven screw when it rotates. One end of the limiting device is fixedly connected to the pump body, and the other end faces the driven screw and abuts against the end of the driven screw. The central axis of the limiting device is collinear with the central axis of the driven screw.

[0004] In the screw pump provided by this patent, the pump casing is fitted inside the pump body, but no sealing structure is provided between the two. The high-pressure liquid inside the conveying chamber can easily seep through the gap between the pump body and the pump casing, forming an external leak. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a high-sealing screw pump.

[0006] The objective of this utility model can be achieved through the following technical solution: A high-sealing screw pump includes a first pump housing, a second pump housing, an intermediate end cover, and a screw assembly. Both sides of the first and second pump housings are flange structures. The first and second pump housings are respectively attached to both sides of the intermediate end cover and fixedly connected by bolts. A first sealing protrusion is formed on both sides of the middle part of the intermediate end cover. A first sealing groove and a second sealing groove are respectively opened in the inner end faces of the first and second pump housings. A first sealing ring and a second sealing ring are respectively installed in the first and second sealing grooves. A liquid outlet flange is fixedly installed on the outer side of the first pump housing. A third sealing groove is opened in the outer end face of the first pump housing. A third sealing ring is installed in the third sealing groove. A pump cover is fixedly installed on the outer side of the second pump housing. A fourth sealing groove is opened in the outer end face of the second pump housing. A fourth sealing ring is installed in the fourth sealing groove. A second sealing protrusion is formed on the inner side of the pump cover.

[0007] In the aforementioned high-sealing screw pump, the screw assembly includes a screw shaft, an external gear sleeve, a bushing, and a locking bushing. One end of the screw shaft is a screw structure, and the other end is a connecting shaft structure. The external gear sleeve is fitted and connected to the outer end of the connecting shaft structure of the screw shaft. A dynamic ring seal is connected to the middle section of the screw shaft. The bushing is fitted and connected to the outer end of the screw shaft on one side of the dynamic ring seal. The locking bushing is installed on the outer end of the bushing, and a fifth sealing groove is opened inside the locking bushing. A fifth sealing ring is installed in the fifth sealing groove, and a sixth sealing ring is installed in the dynamic ring seal.

[0008] In the aforementioned high-sealing screw pump, there are two screw assemblies, the screw shafts are meshed with each other, and the external gear sleeves are meshed with each other.

[0009] In the aforementioned high-sealing screw pump, a screw mounting cavity is provided inside the first pump casing, and the screw structure of the screw shaft is installed in the screw mounting cavity.

[0010] In the aforementioned high-sealing screw pump, a bearing cavity is provided in the intermediate end cover, and a ball bearing is connected to the end of the screw shaft, with the ball bearing installed in the bearing cavity.

[0011] In the aforementioned high-sealing screw pump, the connecting shaft structure of the screw shaft has an external thread on its outer periphery, and a slotted nut is connected to the outside of the external thread.

[0012] In the aforementioned high-sealing screw pump, a sealing end cap is sleeved and connected to the outer end of the screw shaft. A through hole is provided in the pump cover, the screw shaft extends out of the through hole, and the sealing end cap is installed inside the through hole and connected to the pump cover.

[0013] Compared with the prior art, the high-sealing screw pump provided by this utility model has the following beneficial effects: 1. The first sealing protrusion of the intermediate end cover and the sealing groove of the pump casing, and the second sealing protrusion of the pump cover and the sealing groove of the second pump casing form an interlocking structure, which enhances the tightness of the sealing surface and blocks the leakage channel. The sealing design of the dynamic ring seal and the locking bushing strengthens the protection of the weak point of dynamic sealing in the rotating part of the screw shaft, and takes into account both sealing and rotation flexibility; 2. The first pump casing, the second pump casing and the intermediate end cover are fixed by flange structure and bolts. The connection method between the pump cover and the second pump casing, and between the sealing end cover and the pump cover is simple and facilitates quick disassembly and maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is a schematic diagram of the exploded structure of the screw assembly; Figure 4 This is a schematic diagram of the first pump casing structure; Figure 5 This is a schematic diagram of the second pump casing structure; Figure 6 This is a schematic diagram of the locking bushing structure.

[0015] In the diagram: 1. First pump housing; 11. First sealing groove; 12. First sealing ring; 13. Third sealing groove; 14. Third sealing ring; 15. Screw mounting cavity; 2. Second pump housing; 21. Second sealing groove; 22. Second sealing ring; 23. Fourth sealing groove; 24. Fourth sealing ring; 3. Intermediate end cover; 31. First sealing protrusion; 32. Bearing cavity; 4. Screw assembly; 41. Screw shaft; 411. Screw structure; 412. Connecting shaft structure; 413. Dynamic ring seal; 414. Ball bearing; 415. External thread; 42. External gear sleeve; 43. Shaft sleeve; 44. Locking bushing; 441. Fifth sealing groove; 45. Fifth sealing ring; 46. Sixth sealing ring; 47. Slotted nut; 48. Sealing end cover; 5. Liquid outlet flange; 6. Pump cover; 61. Second sealing protrusion; 62. Through hole. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figures 1 to 6 As shown, this embodiment includes a first pump housing 1, a second pump housing 2, an intermediate end cover 3, and a screw assembly 4. Both sides of the first pump housing 1 and the second pump housing 2 adopt a flange structure design. The first pump housing 1 and the second pump housing 2 are tightly fitted to the two end faces of the intermediate end cover 3, respectively. They are fastened by bolts evenly distributed in the circumference through the flange holes, so as to achieve a firm assembly of the three components.

[0018] like Figure 2 , Figure 4 and Figure 5As shown, the middle end cap 3 has a first sealing protrusion 31 integrally formed on both sides of its middle section. Correspondingly, the inner end face of the first pump housing 1 has a first sealing groove 11 adapted to the first sealing protrusion 31, and the inner end face of the second pump housing 2 has a second sealing groove 21 that is also adapted. A first sealing ring 12 is embedded in the first sealing groove 11, and a second sealing ring 22 is embedded in the second sealing groove 21. When the three are assembled, the first sealing protrusion 31, the first sealing ring 12, and the second sealing ring 22 are tightly pressed and fitted together, forming a double end face sealing structure, which effectively prevents media leakage. Meanwhile, a liquid outlet flange 5 is installed on the outer side of the first pump housing 1 by bolts. A third sealing groove 13 is opened on the outer end face of the first pump housing 1, and a third sealing ring 14 is installed in the groove to ensure the sealing of the connection between the liquid outlet flange 5 and the first pump housing 1. A pump cover 6 is fixedly installed on the outer side of the second pump housing 2. A fourth sealing groove 23 is opened on the outer end face of the second pump housing 2, and a fourth sealing ring 24 is installed in the groove. A second sealing protrusion 61 is integrally formed on the inner side of the pump cover 6. After assembly, the second sealing protrusion 61 and the fourth sealing ring 24 are pressed together to further enhance the end sealing effect.

[0019] like Figure 2 and Figure 3 As shown, the screw assembly 4 includes a screw shaft 41, an external gear sleeve 42, a bushing 43, and a locking bushing 44. One end of the screw shaft 41 is a screw structure 411, and the other end is a connecting shaft structure 412. The external gear sleeve 42 is fitted and fixed to the outer end of the connecting shaft structure 412 of the screw shaft 41. A dynamic ring seal 413 is assembled in the middle section of the screw shaft 41. The bushing 43 is fitted and connected to the outer end of the screw shaft 41 on one side of the dynamic ring seal 413, serving as a support and positioning function. The locking bushing 44 is installed on the outer end of the bushing 43.

[0020] like Figure 6 As shown, a fifth sealing groove 441 is provided inside the locking bushing 44, and a fifth sealing ring 45 is installed in the groove. At the same time, a sixth sealing ring 46 is embedded in the dynamic ring seal 413. Through the multiple radial sealing structure, the path of medium leakage along the screw shaft 41 is blocked, which greatly improves the reliability of shaft end sealing.

[0021] To elaborate further, such as Figure 2 and Figure 4 As shown, in this embodiment, the number of screw assemblies 4 is set to two. The screw structures 411 of the two screw shafts 41 mesh with each other, and the external gear sleeves 42 are also meshed with each other, ensuring that the two screw shafts 41 rotate synchronously in opposite directions to achieve stable medium delivery. Correspondingly, the first pump housing 1 has a screw mounting cavity 15 that is adapted to the screw structure 411. The screw structure 411 of the screw shaft 41 is precisely installed in the screw mounting cavity 15 to ensure that the gap between the screw and the inner wall of the pump housing is uniform when the screw rotates, thereby avoiding frictional loss and improving delivery efficiency.

[0022] To elaborate further, such as Figure 2 As shown, a bearing cavity 32 is provided in the middle end cover 3. A ball bearing 414 is connected to the end of the screw shaft 41 by an interference fit. The ball bearing 414 is installed in the bearing cavity 32 to provide stable support for the screw shaft 41, reduce rotational resistance, and improve the smoothness of equipment operation. The connecting shaft structure 412 of the screw shaft 41 has an external thread 415 on its outer circumference. A slotted nut 47 is connected to the outer thread of the external thread 415. The slotted nut 47 can be used to axially lock the external gear sleeve 42, shaft sleeve 43 and other components to prevent the components from loosening during operation.

[0023] To elaborate further, such as Figure 2 As shown, a sealing end cap 48 is sleeved and connected to the outer end of one of the screw shafts 41. A through hole 62 adapted to the screw shaft 41 is opened in the pump cover 6. The screw shaft 41 extends out of the through hole 62. The sealing end cap 48 is installed inside the through hole 62 and is fixedly connected to the pump cover 6 by bolts to form the final sealing protection of the shaft end, further preventing external impurities from entering the pump body and strengthening the overall integrity of the shaft end seal.

[0024] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0025] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A high-sealing screw pump, comprising a first pump housing (1), a second pump housing (2), an intermediate end cover (3), and a screw assembly (4), characterized in that: Both sides of the first pump housing (1) and the second pump housing (2) are flange structures. The first pump housing (1) and the second pump housing (2) are respectively attached to both sides of the middle end cover (3) and fixedly connected by bolts. The middle end cover (3) has a first sealing protrusion (31) formed on both sides of the middle part. The first pump housing (1) and the second pump housing (2) are respectively provided with a first sealing groove (11) and a second sealing groove (21) on the inner end face. The first sealing groove (11) and the second sealing groove (21) are respectively installed with a first sealing ring (12) and a second sealing ring (21). A sealing ring (22) is provided. A liquid outlet flange (5) is fixedly installed on the outside of the first pump housing (1). A third sealing groove (13) is opened in the outer end face of the first pump housing (1). A third sealing ring (14) is installed in the third sealing groove (13). A pump cover (6) is fixedly installed on the outside of the second pump housing (2). A fourth sealing groove (23) is opened in the outer end face of the second pump housing (2). A fourth sealing ring (24) is installed in the fourth sealing groove (23). A second sealing protrusion (61) is formed on the inner side of the pump cover (6).

2. The high-sealing screw pump according to claim 1, characterized in that: The screw assembly (4) includes a screw shaft (41), an external gear sleeve (42), a bushing (43), and a locking bushing (44). One end of the screw shaft (41) is a screw structure (411), and the other end is a connecting shaft structure (412). The external gear sleeve (42) is fitted and connected to the outer end of the connecting shaft structure (412) of the screw shaft (41). A dynamic ring seal (413) is connected to the middle section of the screw shaft (41). The bushing (43) is fitted and connected to the outer end of the screw shaft (41) on one side of the dynamic ring seal (413). The locking bushing (44) is installed on the outer end of the bushing (43), and a fifth sealing groove (441) is opened inside the locking bushing (44). A fifth sealing ring (45) is installed in the fifth sealing groove (441), and a sixth sealing ring (46) is installed in the dynamic ring seal (413).

3. A high-sealing screw pump according to claim 2, characterized in that: The number of screw assemblies (4) is two, the screw structures (411) of the screw shaft (41) are meshed with each other, and the external gear sleeves (42) are meshed with each other.

4. A high-sealing screw pump according to claim 2, characterized in that: The first pump housing (1) has a screw mounting cavity (15) inside, and the screw structure (411) of the screw shaft (41) is installed in the screw mounting cavity (15).

5. A high-sealing screw pump according to claim 2, characterized in that: The intermediate end cap (3) has a bearing cavity (32) and the end of the screw shaft (41) is connected to a ball bearing (414), which is installed in the bearing cavity (32).

6. A high-sealing screw pump according to claim 2, characterized in that: The connecting shaft structure (412) of the screw shaft (41) has an external thread (415) on its outer periphery, and a slotted nut (47) is connected to the outside of the external thread (415).

7. A high-sealing screw pump according to claim 2, characterized in that: A sealing end cap (48) is sleeved and connected to the outer end of the screw shaft (41). A through hole (62) is provided in the pump cover (6). The screw shaft (41) extends out of the through hole (62) and the sealing end cap (48) is installed inside the through hole (62) and connected to the pump cover (6).

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